Apps How does an app interact with an external electronic device?

[StevenHu]

If I wanted to create an app that manipulates, reads the data of, or controls an external electronic device, what coding or technologies are involved in this? Any tutorials? For instance, some apps control an toy RC plane in the room.

 

[StevenHu]

Here is an answer from the iOS side. It's probably true for Android as well:

http://developer.apple.com/library/ios/featuredarticles/ExternalAccessoryPT/ExternalAccessoryPT.pdf